onto

Universal Words (also on to) preposition used with verbs to express movement on or to a particular place or position: Move the books onto the second shelf. * She stepped down from the train onto the platform. PHRASALVERBS be onto sb 1 (informal) to know about what sb has done wrong: She knew the police would be onto them. 2 to be talking to sb, usually in order to ask or tell them sth: They've been onto me for ages to get a job. be onto sth to know about sth or be in a situation that could lead to a good result for you: Scientists believe they are onto something big. * She's onto a good thing with that new job.